Title:
HYDRAULIC SYSTEM WITH ELECTRO-PROPORTIONAL CONTROL MULTI-WORKING-POSITION VALVE, AND CONTROL METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/092667
Kind Code:
A1
Abstract:
A hydraulic system with an electro-proportional control multi-working-position valve, and a control method thereof. The system comprises: a first main pump (2), a second main pump (3), a pilot hydraulic-control joystick group, an arm cylinder (32), a main controller (42), an inward-swing pilot electro-proportional valve (7), and a valve core internally provided with a plurality of working positions. A signal output end of the main controller (42) is in joint control with the inward-swing pilot electro-proportional valve (7), and pilot ports at two external ends of the valve core are respectively in joint control with the pilot hydraulic-control joystick group and the inward-swing pilot electro-proportional valve (7) to regulate and control the working positions of the valve core. The main controller (42) in the hydraulic control system can determine the operating condition of an actuator mechanism, and can thus choose to run and control the hydraulic system in different operating conditions at a heavy-load working position or a light-load working position; and secondly, the area proportion of an oil return flow of an arm rod cavity passing through an oil return one-way valve (13) and a regeneration one-way valve (14) is controlled and regulated by means of the inward-swing pilot electro-proportional valve (7), so as to adapt to different operating conditions, thereby realizing fine regulation of a back pressure proportion of the actuator mechanism, and finally realizing back pressure control of the actuator mechanism under different loads.
Inventors:
SUN HUI (CN)
CUI XIAO (CN)
XIAO GANG (CN)
HUANG FEI (CN)
XU YANCUI (CN)
CUI XIAO (CN)
XIAO GANG (CN)
HUANG FEI (CN)
XU YANCUI (CN)
Application Number:
PCT/CN2021/136610
Publication Date:
June 01, 2023
Filing Date:
December 09, 2021
Export Citation:
Assignee:
JIANGSU ADVANCED CONSTRUCTION MACHINERY INNOVATION CENTER LTD (CN)
International Classes:
F15B13/02; E02F9/22; F15B13/042; F15B13/043
Foreign References:
| CN205742337U | 2016-11-30 | |||
| JPH07305379A | 1995-11-21 | |||
| CN204898750U | 2015-12-23 | |||
| CN110905033A | 2020-03-24 | |||
| EP2535467A1 | 2012-12-19 |
Attorney, Agent or Firm:
NANJING ZONGHENG INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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